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L J E G D I R D 0 O G J m d 0 M O W METHOD OF REPAIRING STRUCTURES WITH BETON 0R CONCRETE.

No. 271,234. Patented Jan, 30, 1883.

'ZUinesses UNITED STATES PATENT OFFICE.

JOHN C. GOODRIDGE, JR., OF NEW YORK, N. Y.

METHOD OF REPAIRING STRUCTURES WITH BE TON OR CONCRETE.

SPECIFICATION forming part of Letters Patent No. 271,234, dated JanuaryBO, 1883.

Application filed February 18, 1882. (No model.)

To all whom it may concern Be it known that I, J OHN O. Goonmnen, Jr., of New York city, in the county of New York and State of New York, have invented a new and useful Improvement in Methods of Repairing Structures with Bton or Concrete, of which the followingis a specification, reference being had to the accompanying drawings.

The saletyof a structure is often endangered from the weakness of its natural or construct ed foundation, and sometimes to such an extent as even to require the demolition and reconstruction of the entire edifice. My invention provides a safe and economical method of repairing such defects.

Figure 1 represents an elevation, and Fig. 2 shows a plan view, of astructure to illustrate my method of repairing the foundation of the same.

Should the natural or constructed foundation or the walls near the same become impaired, I proceed as follows: At some distance from the structure A, and opposite the defective face thereof, I sinlt a trench, B, in length equal to or somewhat longer than the portion to be repaired. The depth to which .the trench B is to be sunk will depend on the nature of the soil, 860., through which it is to be excavated. Afair foundation should be sought. The distance of the trench from the structure will depend on its depth and surrounding circumstances. If circumstances will permit, I first approximate to the depth of the trench B, and then place the same at such a distance from the structure that the diagonal of the mass between the structure and trench will form with the horizontal an angle approximately equal to the natural angle of repose of the material of which the mass is composed. The trench B is thus filled with masonry or other building material, though the purpose of the wall is best subserved by using bton or concrete, which may be introduced in a plastic condition. and will then set and form a monolith. Thus it will be seen that this wall retains the earth surrounding the structure against any tendency toward lateral displacement from the weight of the structure itself. Having completed the outer wall aforesaid, (that in the trench B,) one or more trenches,

O, are run from the said wall to the structure and under it or its foundation should the case require. These trenches should be separated by divisions of the natural material, as shown at E, Fig. 2. The more treacherous the material through which the trenches are to be run the narrower and farther apart they should be..

It is well to make the sides of the sameirregular. As soon as such a trench is completed it is filled with bton or concrete and well rammed, so as to force the same thoroughly into all crevices and irregularities. When the bton, &c.,has set other trenches may be made and filled in the same way until the entire mass between the circumscribing wall and the structure, together with such portions of the natural or constructed foundation of the same as are unsafe, have been removed piecemeal and replaced, as aforesaid. Then, should the nature of the case render it advisable to distribute the weight of the structure more uniforrnly over the whole of the new and enlarged foundation, a buttress, D, of bton or concrete, (or other material,) may be built from the structure to or near to thecircumscribing wall.

In critical cases the buttress D may be built immediately after the wall formed in the trench B and bearing against the same. The buttress would then be made of the form known as a flying buttress. It would be formed in a mold, to be removed after the bton, 850., had set, if a plastic material were used, as is usual. The advantage of this modification is that the structure is supported during all the time of repair. The trenches G are then made under the buttress and filled, as before. Thus it will be seen that anuncertain foundation, whether ear-eat Having now described my invention, what I between such wall and. the structure, in order 20 with concrete or bton, which will set therein in such a manner as to form, when the process is complete, a monolithic foundation, substantially as described.

2. The process of repairing and protecting structures, consisting in first building a circumscribing wall of bton in a previously-dug trench situated at a suitable distance from the sides of the structure, then building a buttress to protect the structure while the other repairs are being accomplished, as set forth.

3. The within-described method of increasing the bulk and weight of structures composed wholly or in part of bton, concrete, or like material, and economizing in the use of the same, by embedding therein hollow forms filled with broken stone, earth, or other heavy and cheap material.

In testimony that I claim the foregoing improvement in method of repairing structures with bton or concrete, as above described, I

have hereunto set my hand this 11th day of February, 1882.

JOHN C. GOODRIDGE, JR. Witnesses:

HENRY P. WELLS, CHARLES G. 00E. 

